The Avengers: Age of Ultron director walked away from the social media website, leading to speculation about why he left.

But now in an interview with Buzzfeed, the Buffy the Vampire Slayer creator has revealed exactly why he left the site.

"Believe me, I have been attacked by militant feminists since I got on Twitter. That's something I'm used to," he told the website.

"Every breed of feminism is attacking every other breed, and every subsection of liberalism is always busy attacking another subsection of liberalism, because God forbid they should all band together and actually fight for the cause."

Revealing that he actually decided to leave to focus on writing non-tweets, he added: "I just thought, Wait a minute, if I’m going to start writing again, I have to go to the quiet place.

(Image: WireImage)

"And this is the least quiet place I’ve ever been in my life. … It’s like taking the bar exam at Coachella. It’s like, Um, I really need to concentrate on this! Guys! Can you all just … I have to … It’s super important for my law!"

Before signing off, the 50-year-old filmmaker wrote in reference to the recent release of the Avengers movie: "Now I may me down to sleep I pray the lord my soul to keep If I should die before I wake 'kay."

Joss thanked his fans in his final tweet, writing: "Thank you to all the people who've been so kind and funny and inspiring up in here."

The director used to be a big Twitter user and had amassed a following of 1.41 million but quit shortly after the latest Avengers movie's release.

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Recently, the filmmaker had jokingly quoted Marvel executives as saying "don't let Joss tweet anything controversial" in a Twitter post, which came after he had to apologise for tweeting that a Jurassic World clip was sexist.

The director's decision to quit the social networking site comes shortly after Joss said he wasn't worried what fans think about the latest Avengers film.

He said: "I don't really think about the fans. I think about what I want because I'm the guy who's taking the comic book he read as a kid and turning it into a movie that I want to see as much as I want people to see it.

"[Marvel Studios president] Kevin Feige and I are fanboys, straight up. But we also know that if you just spend your time catering to the fans you make something that is hermetically sealed. The first question we always ask is: 'What is the way in for someone who has never seen a superhero movie?' You need to be thinking about everybody all the time."